Interesting episode, gentlemen. The first thing that came to my mind as you were describing Lost Horizon: The Musical was Brigadoon. There’s well received musical where you have people from the modern world stumbling into a “magical” land that is cutoff from the rest of the world. Characters fall in love, and must decide whether or not to stay. If nothing else, it shows that the concept can work in a musical format.

Of course, that gets me wondering if Lost Horizon had any influence on Lerner and Loewe, when they were working on Brigadoon? The Lost Horizon novel came out in 1933 and the movie in 1937, while Brigadoon opened in 1947, so it would work timing-wise.